Impurity toroidal rotation and transport in Alcator C-Mod ohmic high confinement mode plasmas

Journal Article · Mon May 01 04:00:00 EDT 2000 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.874004· OSTI ID:20216052

Rice, J E ^[1]; Goetz, J A ^[1]; Granetz, R S ^[1]; Greenwald, M J ^[1]; Hubbard, A E ^[1]; Hutchinson, I H ^[1]; Marmar, E S ^[1]; Mossessian, D ^[1]; Pedersen, T Sunn ^[1]; Snipes, J A ^[1]

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1. Plasma Science and Fusion Center, Massachusetts Institute of Technology, 175 Albany Street, Cambridge, Massachusetts 02139-4307 (United States)

Central toroidal rotation and impurity transport coefficients have been determined in Alcator C-Mod [I. H. Hutchinson et al., Phys. Plasmas 1, 1511 (1994)] Ohmic high confinement mode (H-mode) plasmas from observations of x-ray emission following impurity injection. Rotation velocities up to 3x10{sup 4} m/sec in the co-current direction have been observed in the center of the best Ohmic H-mode plasmas. Purely ohmic H-mode plasmas display many characteristics similar to ion cyclotron range of frequencies (ICRF) heated H-mode plasmas, including the scaling of the rotation velocity with plasma parameters and the formation of edge pedestals in the electron density and temperature profiles. Very long impurity confinement times ({approx}1 sec) are seen in edge localized mode-free (ELM-free) Ohmic H-modes and the inward impurity convection velocity profile has been determined to be close to the calculated neoclassical profile. (c) 2000 American Institute of Physics.

• OSTI ID: 20216052
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 7; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

1-NITROSO-2-NAPHTHOL
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALCATOR DEVICE
ELECTRON DENSITY
EXPERIMENTAL DATA
PLASMA CONFINEMENT
PLASMA DENSITY
PLASMA HEATING
PLASMA IMPURITIES
ROTATION
THEORETICAL DATA